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Improvised weapons have an attack penalty:
Source Core Rulebook pg. 278 4.0
If you attack with something that wasn’t built to be a weapon, such as a chair or a vase, you’re making an attack with an improvised weapon. You take a –2 item penalty to attack rolls with an improvised weapon. The GM determines the amount and type of damage the attack deals, if any, as well as any weapon traits the improvised weapon should have. Improvised weapons are simple weapons.
Personally, I would also reduce the damage to d2 for a coin, they really don't fly well.

breithauptclan |
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Most games that I have been in haven't bothered to track mundane ammunition quantities.
If you are going that route and tracking things that finely, I would probably allow picking up and slinging appropriately sized and weighted items as an improvised weapon. Assuming that the character can find them.
I wouldn't consider a silver piece to be an appropriately sized and weighted item to be used as a sling bullet. A silvered sling bullet is a regular sling bullet with a silver plating. Just like a silver sword is normally a steel core with silver plating. You could make a fully silver sword using high grade silver ingots, but it has quite a bit higher of a price if I recall correctly. I guess you could do the same for sling bullets, but it would again have quite a bit higher price than is normal.